When Concerted Effort's trigger resolves, it will see that Pristine Angel (assuming it's untapped) has flying, protection from artifacts, and protection from all colors. It won't "see" the condition attached to the protections, just that the angel has them. It will then give all your creatures those same abilities.
This means that your Pristine Angel will technically have two copies of its abilities, one of which doesn't care if your angel is tapped or not (because the "must be untapped" condition wasn't copied over). So during that turn, even if your Pristine Angel taps, it will still have protection from artifacts and all colors through the Concerted Effort's effect. Your other creatures will also have it, regardless of whether or not they tap.
October 9, 2018 9:44 a.m.
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October 13, 2018 1:29 p.m.
Just remembered this (I'm working on a cEDH Boros Deck...). Anyway, Answer set. Thanks for the reminder, . I would've forgot about this entirely... Anything else needing my attention? I'll get to those Questions of mine right away.
October 13, 2018 1:53 p.m.
You've also got your other Pristine Angel/Concerted Effort question still in the queue.
October 13, 2018 11:57 p.m.
Just answered it. I wonder what else I've been missing on from awhile back. Thankfully though; Pristine Angel + Concerted Effort combo was since removed for such reasons BTW. Didn't think Colors are the only quality that mattered...